Add support for additional schema/matching rules included with 389
    
    https://bugzilla.redhat.com/show_bug.cgi?id=559315
    Resolves: bug 559315
    Bug Description: Searching some attributes are now case sensitive when they were previously case-insensitive
    Reviewed by: nhosoi (Thanks!)
    Fix Description:
    1) The 60qmail.ldif schema we ship used integerMatch and IA5 syntax
    because we used not to support numericString syntax and matching rules -
    these have been changed to use the standard qmail definitions
    2) Allow IA5String syntax to use caseExactSubstringsMatch - this is required
    by krbPrincipalName